Device for applying strip-shaped adhesive coatings to paper, cardboard and the like

ABSTRACT

A device for producing strip-shaped coatings of adhesive substance on moving webs or blanks, preferably of paper, board or the like, utilises a cylinder, rotating at the rhythm of the strips to be applied, having a longitudinal and annular groove and being surrounded on all sides by a housing with the exception of a narrow discharge slit required for transferring the adhesive substance. The device is particularly characterised in that a longitudinal groove extending at an angle or in herringbone pattern relative to the cylinder axis always provides a point of intersection which travels from one side to the other if the discharge slit is disposed perpendicularly relative to the paper direction for applying herringbone pattern coatings and is disposed at an angle to the paper direction for coatings to be applied transversely relative to the paper direction and in that the longitudinal groove communicates through a housing bore and duct with an annular groove connected to a glue storage container.

I United States Patent [191 Stemmler [75] Inventor: Kurt Sternmler, Neuwied, Germany {73] Assignee: Winkler & Dunnebier, Neuweid am Rhein, Germany [22] Filed: May 15, I972 [21] Appl. No.: 253,127

[30] Foreign Application Priority Data May 17. l97l Germany 2l2446 7 [52] US. Cl. 118/410 [51} Int. Cl. B05c 5/02 [58] Field of Search ll8/4l0, 4i 1, DIG. 4, 324,

[56] References Cited UNITED STATES PATENTS 2,796,146 6/1957 Hersey et al ll8/4l0 x 3,l32,968 5/l964 Wandtke ..-ll8/324 X 3, 27.l36 l/l966 Bartlett'et al ll8/4l0 3.419.934 l/l969 x L'ovett..; ll8/4l0 X 3.51 1,694 5/1970 DEVICE FOR APPLYING STRIP-SHAPED ADHESIVE COATINGS TO PAPER, CARDBOARD AND THE LIKE Lippoldtet al. ll8/DIG. 4

June 4, 1974 Attorney, Agent, or Firm-Richards & Geier [57] ABSTRACT A device for producing strip-shaped coatings of adhesive substance on moving webs or blanks, preferably of paper, board or the like, utilises a cylinder, rotating at the rhythm of the strips to be applied, having a longitudinal and annular groove and being surrounded on all sides by a housing with the exception of a narrow discharge slit required for transferring the adhesive substance. The device is particularly characterised in that a longitudinal groove extending at an angle or in herringbone pattern relative to the cylinder axis always provides a point of intersection which travels from one side to the other if the discharge slit is 'dis posed'perpendicularly relative to the paper direction for applying herringbone pattern coatings and is disposed at an angle to the paper direction for coatings to be applied transversely relative to the paper direc tion and in that the longitudinal groove communicates through a housing bore and duct with an annular 2 Claims 6 Drawing Figures van} This invention relates to a device for applying stripshaped coatings of adhesive substances upon moving webs or blanks of paper, cardboard or the like, by utilising a .flutedeylindcr which rotates at the machine rhythm in a housing surrounding said cylinder on all sides with the exception of a narrow gap.

Devices are known which comprise two concentric, slotted tubes the interior of which is filled with the substance to be applied so that the substance is able to emerge only if the slit of the inner rotating tube is in alignment with the axially parallel slit of the outer stationary tube.

There are other known devices in which a cylinder, having flutes the shape of which is adapted to the coatings to be applied, rotates at the machine rhythm in a housing, filled with the substance to be applied and surrounding the cylinder with the exception of the gap required for applying the coatings, the flutes being charged on traversing through the housing and delivering their charge on reaching the housing gap by physical contact with the material which is to be printed.

All these devices have substantial drawbacks. In the case of the concentric cylinder and its developments it is possible to apply only a gumming which extends rectilinearly transversely to the paper direction. If the machine stops when the control slits are in alignment it is possible for the glue to be discharged without obstruction. Similar conditions occur if a sheet is missing. In both cases the base is contaminated so that reliable operation of the machine becomes questionable.

In the system having a cylinder with flutes there is a risk that the glue filling is discharged if the machine stops and the application flute happens to be disposed below the doctors so that reliable operation of the machine in this case also becomes questionable.

An object of the present invention is to eliminate these drawbacks of existing constructions.

Another object of the present invention is to provide a device which enables coatings to be applied which extend transversely or at angle to the paperdirection or in herringbone pattern but without the above disadvantages, namely. without causing contamination and therefore operational disturbances of the machine in the event of stopping thereof or in the absence-of a sheet.

Other objects of the present invention will become apparent in the course of the following specification.

In the accomplishment of the objectives of the pres ent invention it was found desirable to provide a longitudinal groove. extending at an angle or in herringbone pattern relative to the cylinder axis. This groove always provides a point of intersection which travels from one side to the other if the discharge slit is disposed perpendicularly relative to the paper direction for applying herringbone pattern coatings and is disposed at an angle to the paper direction for coatings to be applied transversely relative to the paper direction. The longitudinal groove communicates through a housing bore and duct with an annular groove connected to a glue storage container. I

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing showing by way of example only a preferred embodiment of the inventive idea. I

In the drawing:

FIG. I is a schematic longitudinal section through the device of the present invention.

FIG. 2 is a cross-section through FIG. 1 along the line FIG. 3 is a cross-section through an applicator strip which covers the flute.

FIG. 4 is a basic diagram of the drawing overlap.

FIG. 5 is a part view of an applicator cylinder.

FIG. 6 is a side view of FIG. 5.

The drawing shows an applicator cylinder 1 rotatably supported in a base member provided with a longitudinal slit 2. The base member comprises a fixed part 3 with side walls 3 and a vertically movably supported sliding pad 4 which is thrust by springs 5 aganist the applicator cylinder 1 and surrounds it in sealing-tight manner. Adhesive substance is supplied through a pipe line 6, screw-mounted in the stationary member 3. This pipe line communicates through a bore extending through the sliding pad with an annualor groove 8 of the applicator cylinder. A longitudinal groove 11, arranged in herringbone pattern, and covered by a sheet metal strip 10, provided with a fine longitudinal slit 9, extends into a concentric arcuate groove 12, provided in the cylinder endfaces. The length ofthis groove is dimensioned in accordance with the angle of inclination of the longitudinal groove, the cylinder endfaces being guided in the axial direction by'the side walls of the base member while the concentric grooves 12 on the endfaces are simultaneously closed.

The adhesive substance which is pressurised in the grooves can be discharged only during the rotating motion of the applicator cylinder if the longitudinal slit over the groove 11 is disposed over the slit 2 which is provided in the base member. Owing to the herringbone pattern of the longitudinal groove 11, the adhesive substance'is applied not simultaneously over the entire paper width which is to be gummed but progressively from the middle to both sides, sudden reduction of the pressure being avoided. If the coating to be applied is to extend transversely to the paper direction instead of in a herringbone pattern and in order to maintain the drawing overlap (FIG. 4) from the discharge slit 2 and the longitudinal groove 11 it is necessary for the discharge slit 2 to extend at an angle to the paper direction and for the longitudinal groove 11 provided in the applicator cylinder to extend in a manner which is also adapted to the aforementioned angle of inclination. The entire device is adapted to pivot in a manner not shown relative to the paper direction in order to enable coatings to be applied which extend transversely to the paper direction as well as in a herringbone pattern.

If a sheet is missing in the sequence in which the blanks are fed in, the emerging glue will be discharged through a slit 14' in the paper guide plate 14 into a collector trough 13 without contaminating the plates 14.

The chambers l5, 16 attached to the endfaces, are provided to collect the glue in the event that the machine is accidentally stopped when the applicator cylinder is in the ejection position. The supply of glue is interrupted in this case and communication is provided between the longitudinal groove ll and the lateral chambers I5, 16, namely, by the discs 17, I8 being rotated by the levers I9, 20 through electromagnets (not shown). so that the bores 21, 22 are in alignment with the bores 23, 24 disposed in the side walls 3 of the stationary part of the base member. Suction is simultaneously applied through the pipe lines 25, 26 to the chambers l5, 16 so that the adhesive substance still contained in the grooves enters the chambers l5, 16 through the arcuate concentric grooves 12 and through the bores 21, 23 or 22, 24, respectively, and is not discharged through the discharge slit 9.

The entire apparatus may be electrically heated in a manner not shown and is therefore particularly suited for the application of hot glues.

I claim:

l. A device for applying strip-shaped adhesive coatings on moving webs and blanks of paper, cardboard and the like, comprising a rotary cylinder having a longitudinal groove extending at an angle or in herringbone pattern to the axis of the cylinder, said cylinder also having an annular groove communicating with said longitudinal groove, a housing enclosing saidcylinder and having a bore communicating with said longitudinal groove, and a discharge slit, a glue transmitting duct carried by said housing and communicating with said bore, said longitudinal groove providing a point of in tersection which travels from one side to the other if the discharge slit, is disposed perpendicularly relative 

1. A device for applying strip-shaped adhesive coatings on moving webs and blanks of paper, cardboard and the like, comprising a rotary cylinder having a longitudinal groove extending at an angle or in herringbone pattern to the axis of the cylinder, said cylinder also having an annular groove communicating with said longitudinal groove, a housing enclosing said cylinder and having a bore communicating with said longitudinal groove, and a discharge slit, a glue transmitting duct carried by said housing and communicating with said bore, said longitudinal groove providing a point of intersection which travels from one side to the other if the discharge slit, is disposed perpendicularly relative to the paper direction for applying herringbone pattern coatings and is disposed at an angle to the paper direction for coatings to be applied transversely relative to the paper direction, pairs of rotary discs located on opposite ends of said cylinder and having glue transmitting openings, and means forming glue collecting chambers communicating with said openings.
 2. A device in accordance with claim 1, comprising a sheet metal strip having a longitudinal slit and covering said longitudinal groove. 